Bunch building mechanism



Aug. 4, 1931. SMITH 1,817,106

BUNCH BUILDING MECHANISM Filed Nov. 13. 1929 2 Sheets-Sheet l mmmlmnmlm INVENTOR.

ATTORNEYl Aug. 4, 1931. A. SMITH 1,817,106

BUNCH BUILDING MECHANISM Filed Nov. 13. 1929 2 Sheets-Sheet 2 ,6 I NVENTOR.

BY MA -J A TTQRNEY Patented Aug. 4, 1931 UNITED STATES PATENT OFFICE ALLEN SMITH, OF MILL'BURY, MASSACHUSETTS, ASSIGNOR TO WHITIN MACHINE WORKS, F WHITINSVILLE, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS BUNCH BUILDING MECHANISM Application filed November 13, 1929. Serial No. 406,958.

This invention relates to a bunch building mechanism to be applied to a spinning or twisting machine.

It is found desirable in the operation of @certain kinds of weft detecting mechanism in looms that a preliminary bunch of yarn be wound at tl e base of the bobbin before the regular winding of the bobbin begins. This bunch provides a storage of yarn sufficient for one or two picks of the loom after substantial weft exhaustion is indicated and before the bobbins are changed.

It is the object of my invention to provide an improved and simplified mechanism for such purposes, by which a bunch of a desired size may be wound and by which the change to regular wind will be automatically accomplished.

A further object is to provide a mechanism by which the re-winding of the builder mechanism will automatically set the bunch building mechanism in operative position.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings, in which Fig. 1 is a side elevation of parts of a spinning frame enbodying my improvements;

Fig. 2 is a side view of a bobbin having a bunch wound thereon;

Fig 3 is a plan view of my improved bunch building mechanism or attachment;

Fig. 4 is a side elevation thereof;

Fig. 5 is an enlarged side elevation of the locking lever;

Fig. 6 is an end view thereof;

Fig. 7 is a partial side elevation of the traverse adjusting shaft, and

Fig. 8 is a sectional end view thereof taken along the line 8-8 in Fig. 7.

Referring particularly to Fig. 1, I have shown parts of a cap spinning machine, comprising a frame 10 having a cross rail 11 in which fixed vertical rods 12 are mounted. The rods 12 support caps 14 which partially enclose a series of bobbins B, rotatably mounted on a bobbin rail 16, which in turn is supported on suitable lifter rods 17. The bobbins are rotated by belts 18 and the yarn is delivered to the bobbins around the lower edges of the caps 14, the distribution of the yarn on the bobbins being determined by the reciprocating vertical movement of the bobbins 13 relative to the fixed caps 14.

Builder mechanism A usual type of builder mechanism is shown in the drawings, by which the bobbin rail 16 and bobbins B may be vertically reciprocated. An arm 20 is secured to the lower end of one of the lifter rods 17 and is connected by a chain 22 to a connecting rod 23 slidable longitudinally of the machine. Suitable guide pulleys 24 are provided for the chain 22.

The connecting rod 23 is secured by screws 25 to a member 26 slidable on a fixed guiderail or frame member 27. An adjustable stop plate 28 limits the sliding movement of the member 26 and determines the lower limit of yarn travel on the bobbins B.

A heart-shaped cam 30 is mounted on a shaft 31 having a worm gear 32 rotated by a worm 33 on a worm shaft 34. The shaft 34 is rotated through suitable gearing 35 from a driving pulley 36. The cam 30 engages a cam roll 38 on a short lever 39 pivoted at 40 on the fixed frame member 27.

A second or long lever 41 is pivoted at 42 on a depending projection of the frame member 27, and the lever 41 has a bearin g portionv 42 on which is mounted for lengthwise adjustment abracket 43 carrying a roll 44. T he roll 44 engages a surface 45 of the short lever 39 and thus transmits motion from the lever 39 to the lever 41. The motion of the lever 41 may be relatively increased or decreased by raising or lowering the bracket 43.

A nut is swivelled in a bracket 51, which is also mounted for vertical adjustment on the long lever 41. An adjusting shaft 54 is threaded in the nut 50 and has a bearing 26 is held from sliding movement.

the gcamv shaft 31'- previously described; andin the usual. construction the cam shaft makes about thirty revolutions to each revolution of the threaded shaft 54.

With the construction thus far described, a

bobbin may be woundwith-the-usual filling wind in which the yarn is given a relatively short traverse on the bobbin and in which.

the locus of this short traverse. is gradually advanced'toward thetip-of the bobbin, so that successive conical layers of yarn are placed on the bobbin.

, This gradual advance movement of the locus of the winding is caused by the slow rotation of the threaded shaft 54, as the shaft constitutes the only operative connection between the long-lever 41 and the sliding member 26.- As the shaft is gradually rotatedin the direction of the arrow at in Fig. 1, the distance betweenthe nut and the sliding member 26is reduced and the bobbin rail 16 is lowered, thus causing the yarn to be wound nearer the tip of the bobbin.

In order to adapt this windingmechanism to the purposes of this invention, I provide locking-lever (Figs. 3 to 6) which is piv- 3 oted' at 61 on a stud fixed in the frame 27.

The lever is provided with a shoulder 62 adapted to engage the right-hand side ofthe sliding member 26 (as viewed'in'the drawlugs) and to preventmovement of the member 26 to the right as the cam 30 passes its apex. The bobbin rail is thus held in a sub'- stanti'ally fixed position so that abunch is wound near the base of the bobbin as, inclicated at A in Fig. 2.

An offset arm 64 issecured to the opposite end of the lever 60 and is provided with a roll 65 pivoted thereon and positioned to ens gage a cam or lug 66 which is mounted'on a plate or feather 67 (Figs. 7 and 8) detachs ably secured in a slot orkey-way 68 in the shaft 54. c

When the roll 65 rests on the cam 66, the. lever 60 is depressed to the operative position shown in Figs. 1 and 5 and the member A spring 7 O is attached to a stud/71in the end of the lever 60 and-acts strongly to move the lever 60 to inoperative position.

The operation of my improved bunch building mechanism is as follows:

When the winding of a set of bobbins is completed, the Y operator raises the latch 59 (Fig. 1) and slides the gear 58 out of mesh, so that the threaded shaft 54 may be turned freely by the hand wheel 57. The operator then turns the shaft 54 until the slide 26 is forced backward against the stop 28. In this position the slide 26 clear-s the shoulder 62 of the lever 60, as indicated in Fig. 5.

The parts are so adjusted that the cam 66 will stop under the roll 65whenthe slide 26 strikes the stop 28. The cam 66 thus depresses the locking lever 60 and prevents the slide 26 frominoving to the rights and lowering the bobbin rail 16: during the initial winding of the bobbin.

The shaft 54Erotates in the direction of the arrow 6 in Fig. 8 and the cam 66 soon passes out from under the roll 65, due to angular movement, of the shaft 54. The spring then raises the lever 60, releasing the slide. 26 and allowing the usual builder mechanism to function.

It is desirable that the lever 60 release the slide 26 atthe moment when the roll 38' (Fig.

1) is against the point of the heart-shaped;

cam 30, so that-there will not be any quick movement or jar of'the bobbin rail when the slide 26 is released.- 7

The screw threads onthe shaft 54-are of relatively steep pitch, so that a single revolution ofthe'shaft 54 brings the cam 66 approximately to the dotted line position indicated in Fig. 5 and well'out of range with the roll 65. Consequently, the cam 66 engages the roll 65 only on-the first part of the initial revolution of the shaft 65.

The length of yarn in-the bunch may be varied by changing the cam 66] on the shaft 54,- substituting a cam of slightly different contour, or the length oflyarn may be varied to some extent by adjustment offthe stop 28.

Having described thedetails of: construction of my invention, it willibe seen that I have provided a very, simple-mechamsm by which a bunch of a desired size may be wound'at the bottom o-fa b'obbin'before the usual filling :'\VII1Cl begins.

My improved hunch building mechanism contains few parts which are easily adjusted and which arecnot readily displacedor rendered inoperative.

Having thus described my inventionand the advantages thereof, I do not wishtobe.

limited to the details herein disclosed, other- A wise than as setforth in the claims, but what I claim is 1. In a bunchbuilding mechanism; aslidably mounted member controlling the winding of the yarn, meansto regularly I'GCIPI'Os cate said. member, and means to interrupt the reciprocation of'said member for. a-pre determined: period, said 'means including a locking lever movable into the path of said sliding member, a thr'eaded shaft rotatable to change the locus of reciprocation of said sliding member, and a; cainfixed on said shaft and operable toeffectinovement of said lever to lockingposition when said shaft is returned to initial position for starting the Winding of a set of bobbins.

2. In a bunch building mechanism, a slidably mounted member controlling the winding of the yarn, means to regularly reciprocate said member, and means to interrupt the reciprocation of said member for a predetermined period, said means including a locking lever movable into the path of said sliding member, a cam to move said lever to locking position, and means to move said cam from operative position by both rotary and axial advance movement of said cam.

3. In a bunch building mechanism, a slidably mounted member controlling the winding of the yarn, means to regularly reciprocate. said member, and means to interrupt the reciprocation of said member for a predetermined period, said means including a locking lever movable into the path of said sliding member, a threaded shaft for varying the locus of Winding on the bobbins, and a cam on said shaft engaging said locking lever, said cam and shaft being rotated and also being moved lengthwise relative to said lever by the continued operation of the machine.

4. In a bunch building mechanism, a slidably mounted member controlling the wind ing of the yarn, means to regularly reciprocate said member, and means to interrupt the reciprocation of said member for a predetermined period, said means including a locking lever movable into the path of said sliding member, a threaded shaft for varying the locus of winding on the bobbins, a cam on said shaft engaging said locking lever, and means to rotate said shaft and to cause said shaft to move axially relative to said lever, Whereby said cam is first moved from operative position by rotary movement of said shaft and is further moved from operative position by relative axial movement of said shaft.

In testimony whereof I have hereunto affixed my signature.

ALLEN SMITH. 

